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