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