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