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