If you are builing a desert tan version, than yes go with sand around the frame. Otherwise a green interior for the Euro green color. There is a lot of of dark gray or black parts as well in the actual vehicle interior, but I don't know how accurate the kit is to reflect these. These sites have a couple peeks inside:
https://www.army.mil/article/262207/airmen_attend_jltv_operator_new_equipment_training_course_at_fort_mccoy_for_first_time
https://www.dvidshub.net/image/7051899/drivers-training
Otherwise this YouTube video has a couple quick looks too from other angles.
https://www.youtube.com/watch?v=G2JYcbHF1J4&ab_channel=USAMilitaryPower