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