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