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