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