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