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