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