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