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