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