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