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