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