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)(11,13)(12,14)(15,16)(19,26)(22,32)(27,28)(29,31) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,13,14,16)(17,18,20,24)(19,27,26,28)(21,23,30,25)(22,31,32,29)(10,14)(13,16)(17,19,20,26)(18,22,24,32)(21,31,30,29)(23,27,25,28)(1,4,5,3)(2,6,7,8)(17,18,20,24)(19,28,26,27)(21,23,30,25)(22,29,32,31)(18,23)(19,26)(21,30)(22,28)(24,25)(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.