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