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