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