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