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