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