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