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