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