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