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