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