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