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