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