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