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