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