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