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