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)(11,13)(12,14)(15,16)(17,18,22,27)(19,28,29,24)(20,30,31,25)(21,32,23,26)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,21)(22,29)(23,31)(25,32)(26,30)(27,28) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(11,15)(10,14)(13,16)(17,20,21,19,22,31,23,29)(18,25,32,24,27,30,26,28)(2,5)(6,8)(17,21,22,23)(18,26,27,32)(19,20,29,31)(24,30,28,25)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.