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