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