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