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