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