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