One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,8)(9,10,13,15)(11,16,12,14)(17,18,21,23,22,25,20,26)(19,27,28,32,29,31,30,24)(2,4)(9,11,13,12)(10,14,15,16)(18,23)(19,28)(20,21)(25,26)(27,31)(29,30)(2,4)(9,12,13,11)(10,14,15,16)(17,19,22,29)(18,24,25,32)(20,28,21,30)(23,31,26,27)(6,8)(18,25)(19,29)(23,26)(28,30) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.