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