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