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