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