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