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