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