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