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