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