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