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