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