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