One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,8)(5,7)(9,10,14,20,15,21,16,22)(11,23,26,35,27,36,28,17)(12,19,30,40,13,18,32,38)(24,39,29,33,25,37,31,34)(1,3,5,4)(2,6,7,8)(9,11,15,27)(10,17,21,35)(12,29,13,31)(14,28,16,26)(18,37,19,39)(20,36,22,23)(24,32,25,30)(33,40,34,38)(1,4,5,3)(2,6,7,8)(9,12,15,13)(10,18,21,19)(11,24,27,25)(14,30,16,32)(17,33,35,34)(20,38,22,40)(23,37,36,39)(26,29,28,31)(9,13,15,12)(10,19,21,18)(11,25,27,24)(14,30,16,32)(17,34,35,33)(20,38,22,40)(23,37,36,39)(26,29,28,31)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.