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