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