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