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