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