That lizard is a species in the family Agamidae. Chameleons belong to the family Chamaelionidae.

Whilst I am no expert in the group, I will make a guess that it is in the genus Calotes. And if I had to hazard a guess further, I would suggest that it might be Calostes versicolor. It is also likely a male of the species. These lizards can also exhibit colour change (albeit slower and not as extensive as chameleons), and so grouping them with chameleons is not unexpected.

However, I would recommend that you use my suggestion only as a starting point, and look further in local books, universities or museums. Good luck with your search. And please report back if you get a positive identification.