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