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