One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7,8,5)(4,6)(9,10,12,14,13,16,11,15)(17,18)(19,27,29,31)(20,25)(21,24)(22,26)(23,28,32,30)(1,3)(2,5)(4,8)(6,7)(10,14)(11,12)(15,16)(17,19)(18,23)(20,28)(21,30)(22,29)(24,31)(25,27)(26,32) involution — undirected(9,11,13,12)(10,14,16,15)(17,20,22,21)(18,24,26,25)(19,28,29,30)(23,31,32,27)(17,20,22,21)(18,25,26,24)(19,28,29,30)(23,27,32,31)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.