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)(18,23)(20,21)(24,31)(25,29)(26,27)(30,32)(11,12)(14,16)(17,18)(19,24)(20,23)(21,29)(22,25)(26,31)(27,30)(28,32) involution — undirected(2,5)(3,8)(6,7)(9,10)(11,14)(12,16)(13,15)(17,19,22,28)(18,24,25,32)(20,27,21,26)(23,30,29,31)(9,11,13,12)(10,14,15,16)(17,20,22,21)(18,23,25,29)(19,26,28,27)(24,31,32,30)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.