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