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