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