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