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