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