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