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