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