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