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