Dravidian is a language term, not a race term, assuming that the original Dravidian speakers were the population of the Indus Valley, I'm guessing they looked like dark Caucasians and they were probably the second group that migrated to India after the Aboriginal looking ones. In South India today you see these looks, we see darker Indians but some of them clearly look more Caucasian than anything, and based on the language comparison apperantly Elamite resembles Dravidian languages, makes sense since the regions are actually right next to one another and being from the same stock makes sense, in fact I think the Sumerians might also be similar but that's a whole separate story.