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