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