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