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