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