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