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