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