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