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