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