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