An internal listing of open jobs is not an internal mobility program. Please stop thinking that it is.
You can focus on the top of your funnel to improve your diversity hiring. If you want more diverse hires, you need to have more diversity in your pipeline.
Your Boss walks into your office and says I would like you to start going to campus. Before you order one giveaway, table display or contact a campus office stop and ask “Why?” What problem will a college recruiting program solve?