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