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