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