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)(11,14)(12,13)(15,16)(17,18,22,26)(19,23,27,31)(20,25,21,24)(28,30,29,32)(2,6)(4,7)(10,13)(11,15)(17,19)(18,23)(20,28)(21,29)(22,27)(24,32)(25,30)(26,31) involution — undirected(1,3,5,8)(2,7,6,4)(9,11,12,15)(10,14,13,16)(18,24)(19,27)(20,21)(23,30)(25,26)(31,32)(2,6)(3,8)(10,13)(14,16)(17,20,22,21)(18,25,26,24)(19,28,27,29)(23,30,31,32)(1,4,5,7)(2,8,6,3)(19,27)(23,31)(28,29)(30,32)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.