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