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