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