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