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