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