At a guess I'd say whites would be under-represented and people from asian ethinc backgrounds would be over-represented (probably true across engineering subjects). But nonetheless the difference from the general population is relatively insignificant when compared to the gender gap (where the difference is huge).
Saw a TIL Reddit thread recently that stated Indians make up 1% of the population but account for 40% of engineering jobs or something (paraphrasing as I don't remember the exact numbers and didn't read the article linked).
