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