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