First, if you do not already have a working relationship with the campus ministers or local religious leaders around campus, introduce yourself to them. Meet for coffee or for lunch and discuss the joys and challenges of your ministry. Chances are you will find that you all share a lot in common.
Second, commit to meet on a regular basis. Once a month is a good rule of thumb. Once you have established good relations with them, then you can begin to discuss how you can work together to address issues of common concern. Combining resources for works of charity and social justice is always fertile soil for interreligious collaboration. The Interfaith Youth Corps and the 20,000 Dialogues Project are good resources for ideas.