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