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