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