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)(19,23)(20,30)(21,24)(22,25)(26,28)(27,31)(29,32) involution — undirected(1,3,7,4)(2,5,8,6)(9,10)(11,15)(12,14)(13,16)(17,19)(18,23)(20,31)(21,28)(22,29)(24,26)(25,32)(27,30)(1,4,7,3)(2,5,8,6)(9,11)(10,13)(12,16)(14,15)(17,20,30,18,22,24,21,25)(19,26,27,32,29,31,28,23)(1,5,7,6)(2,3,8,4)(11,16)(13,15)(17,21,22,30)(18,24,25,20)(19,27,29,28)(23,31,32,26)(1,6,7,5)(2,3,8,4)(10,14)(13,15)(17,21,22,30)(18,24,25,20)(19,28,29,27)(23,26,32,31)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.