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