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