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