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