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