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