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