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