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