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