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