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