J.W.
When I tried it before with a yellow cake and regular sprinkles the color came off all of the sprinkles. I think maybe they do something a little bit different to the sprinkes that come with the cake mix.
What you could do though, instead of mixing them all in the cake mix, like I did, put some mix in the pan and add some sprinkles, then add a little more mix and sprinkles, and so on. That way you won't be mixing it al up and the color should stick better.
Good luck!