As you may know the head of the DEI committee is not the Vice President, rather it is a member of the committee itself who is elected by their fellow committee members.
The responsibilities of the DEI Chair is to head meetings and topics of discussion. As well as make the final decision as to any programs or events for the Vice President to propose to the E-board.
While the Vice President is the Liaison to the DEI committee and has veto and voting power; as well as must be in attendance at all DEI meetings. The main job of the Liaison position is to be the voice of the DEI committee to the E-board and the E-board's voice to the committee.