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