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