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)(17,18,23,21)(19,22,26,24)(20,28,30,25)(27,31,32,29)(3,4)(7,8)(11,15)(13,16)(18,21)(19,26)(25,28)(27,32) involution — undirected(1,3)(2,7)(4,6)(5,8)(9,10)(11,13)(12,14)(15,16)(17,19,23,26)(18,24,21,22)(20,27,30,32)(25,31,28,29)(3,4)(7,8)(17,20,23,30)(18,25,21,28)(19,27,26,32)(22,29,24,31)(1,4,6,3)(2,7,5,8)(9,11,12,15)(10,13,14,16)(17,21,23,18)(19,22,26,24)(20,28,30,25)(27,29,32,31)(1,5,6,2)(3,7,4,8)(9,10)(11,13)(12,14)(15,16)(17,22)(18,19)(20,29)(21,26)(23,24)(25,27)(28,32)(30,31)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.