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