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)(11,15)(12,13)(14,16)(18,21)(19,23)(25,26,28,30)(27,29,31,32)(2,3)(6,7)(9,11)(10,14)(12,15)(13,16)(18,21)(22,24)(25,27,28,31)(26,29,30,32)(4,8)(6,7)(10,12)(14,15)(17,18)(19,22)(20,21)(23,24)(25,26)(27,29)(28,30)(31,32) involution — undirected(1,3,5,2)(4,6,8,7)(9,11)(10,15)(12,14)(13,16)(17,18)(19,22)(20,21)(23,24)(25,27)(26,29)(28,31)(30,32)(1,4,5,8)(2,6,3,7)(9,12,13,10)(11,15,16,14)(17,19)(18,22)(20,23)(21,24)(25,26)(27,29)(28,30)(31,32)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.