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