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