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