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