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