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