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