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