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