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