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