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