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