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)(12,14)(15,16)(17,18)(19,28)(20,24)(21,29)(22,32)(23,27)(25,31)(26,30)(1,3,5,4)(2,6,8,7)(9,11)(10,13)(12,15)(14,16)(17,19,23,31)(18,25,27,28)(20,26,32,29)(21,22,30,24)(10,14)(11,15)(17,20)(18,22)(19,29)(21,25)(23,32)(24,27)(26,31)(28,30) involution — undirected(10,14)(13,16)(17,21,24,19,23,30,22,31)(18,26,20,25,27,29,32,28)(1,4,5,3)(2,7,8,6)(17,22,23,24)(18,20,27,32)(19,30,31,21)(25,26,28,29)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.