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