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)(11,13)(12,15)(14,16)(17,18)(19,23)(20,24)(21,25)(22,26)(27,31)(28,30)(29,32)(1,3,5,4)(2,6,8,7)(11,16)(13,14)(17,19)(18,23)(20,28)(21,27)(22,29)(24,30)(25,31)(26,32)(10,13)(11,16)(14,15)(18,24)(19,27)(20,21)(25,26)(28,29)(30,31) involution — undirected(1,4,5,3)(2,7,8,6)(17,20,22,21)(18,24,26,25)(19,28,29,27)(23,30,32,31)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.