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