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