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