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