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