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