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