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