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