Maybe the females you are seeing are small?
from my knowledge they do colour up alot more at breeding but in general the females are brightly coloured? İ think you've been seing Urophthalmus (mayan cichlid) ive kept a large 11" female and they arent particularly colourfull. these guys are Sold as Festæ or "red terror" all too often. a real festæ female would be brightly coloured.