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