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