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