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