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