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