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