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