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