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)(19,22)(20,23)(21,24)(25,28)(26,31)(27,29)(30,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,10)(11,16)(12,15)(13,14)(17,19)(18,22)(20,27)(21,26)(23,29)(24,31)(25,30)(28,32)(9,11,13,12)(10,15,14,16)(18,23)(20,28)(22,29)(24,25)(27,32)(30,31)(1,4,5,3)(2,6,7,8)(9,12,13,11)(10,15,14,16)(17,19)(18,22)(20,27)(21,26)(23,29)(24,31)(25,30)(28,32)(18,24)(19,26)(23,25)(27,32) 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.