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