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