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