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