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