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