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