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