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