Males from the C.dilepis group and subspecies, are smaller than their female counter parts. Males also have spurred hind feet, a higher casque. You can also tell from the shape of the vent and tail base.
Even though this group consists of more muted tones, you may see a range of colours, though it will most likely be primarily green or yellowish. It may have patterns with a light horizontal line. During certain reactions, (ie. pregnancy, aggressive displays, etc.) it will most likely exhibit blotches and spots in black, blues, or yellows.
If this Chameleon is already in your care, it would be wise to check up on your husbandry as they may require slightly different requirements than Panther Chameleons and Veiled Chameleons for which most of the online care sheets are focused on.