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