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