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