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