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