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