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