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