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