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