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