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