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