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