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)(11,13)(12,14)(15,16)(17,18,21,25)(19,24,20,23)(22,26,29,32)(27,31,28,30)(1,3)(2,5)(4,8)(6,7)(9,11,12,15)(10,13,14,16)(19,27)(20,28)(22,29)(23,30)(24,31)(26,32)(10,14)(13,16)(17,19)(18,23)(20,21)(22,28)(24,25)(26,31)(27,29)(30,32) involution — undirected(2,6)(5,7)(19,20)(23,24)(27,28)(30,31) involution — undirected(3,8)(5,7)(17,20,21,19)(18,24,25,23)(22,27,29,28)(26,30,32,31)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.