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