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