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