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