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