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