One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(9,10)(11,14)(12,13)(15,16)(17,18)(19,23)(20,25)(21,26)(22,24)(27,30)(28,32)(29,31)(5,6)(7,8)(10,13)(14,16)(19,27)(20,21)(23,30)(25,26)(28,29)(31,32) involution — undirected(2,4)(6,8)(11,15)(14,16)(17,19,21,28,22,29,20,27)(18,23,26,32,24,31,25,30)(9,11,12,15)(10,14,13,16)(18,24)(23,31)(25,26)(30,32)A 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.