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