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