These are my personal highlight color preferences.

There is no specific setting for enemy color, it varies by the situation.
Usually they're the same color as allies unfortunately.
Sometimes they will start off one color and change if you save and reload.

I don't know how the "social" highlighting works, I couldn't find a situation that used it.

Copy to your StarfieldCustom.ini:

[Monocle]

; [blue] SCANNED RESOURCES
fHighlightScannableOutlineThickness_TargetFullyScanned=2.0
fHighlightScannableOutlineThickness_FullyScanned=2.0
aHighlightScannableFillColor_TargetFullyScanned=0,0,0,0
aHighlightScannableOutlineColorHigh_TargetFullyScanned=62,173,242,255
aHighlightScannableOutlineColorLow_TargetFullyScanned=62,173,242,255
aHighlightScannableFillColor_FullyScanned=62,173,242,8
aHighlightScannableOutlineColorHigh_FullyScanned=114,192,255,255
aHighlightScannableOutlineColorLow_FullyScanned=114,192,255,255

; [blue] SCANNED FLORA FAUNA & SOME CORPSES
fHighlightScannableOutlineThickness_TargetScanned=2.0
fHighlightScannableOutlineThickness_Scanned=2.0
aHighlightScannableFillColor_TargetScanned=0,0,0,0
aHighlightScannableOutlineColorHigh_TargetScanned=62,140,242,255
aHighlightScannableOutlineColorLow_TargetScanned=62,140,242,255
aHighlightScannableFillColor_Scanned=62,140,242,8
aHighlightScannableOutlineColorHigh_Scanned=62,140,242,128
aHighlightScannableOutlineColorLow_Scanned=62,140,242,128

; [green] ALLIES & SOME ENEMIES & SHIPS & UNSCANNED FLORA FAUNA RESOURCES
fHighlightScannableOutlineThickness_TargetScannable=2.0
fHighlightScannableOutlineThickness=2.0
aHighlightScannableFillColor_TargetScannable=0,0,0,0
aHighlightScannableOutlineColorHigh_TargetScannable=31,224,192,255
aHighlightScannableOutlineColorLow_TargetScannable=31,224,192,255
aHighlightScannableFillColor=31,224,192,8
aHighlightScannableOutlineColorHigh=31,224,192,255
aHighlightScannableOutlineColorLow=31,224,192,255

; [yellow] LOOT & SOME ENEMIES & SOME CORPSES
fHighlightScannableOutlineThickness_TargetGeneric=1.5
fHighlightScannableOutlineThickness_Generic=1.5
aHighlightScannableFillColor_TargetGeneric=0,0,0,0
aHighlightScannableFillColor_Generic=242,173,62,8
aHighlightScannableOutlineColorHigh_TargetGeneric=242,173,62,255
aHighlightScannableOutlineColorLow_TargetGeneric=242,173,62,255
aHighlightScannableOutlineColorHigh_Generic=242,173,62,255
aHighlightScannableOutlineColorLow_Generic=242,173,62,255

; [soft reddish purple] JUNK
fHighlightScannableOutlineThickness_Tracked=1.0
aHighlightScannableFillColor_Tracked=0,0,0,0
aHighlightScannableOutlineColorHigh_Tracked=192,32,96,64
aHighlightScannableOutlineColorLow_Tracked=192,32,96,64

; [purple] SOCIAL? UNUSED?
fHighlightScannableOutlineThickness_Social=2.0
aHighlightScannableFillColor_Social=192,32,96,16
aHighlightScannableOutlineColorHigh_Social=192,32,96,255
aHighlightScannableOutlineColorLow_Social=192,32,96,255