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