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