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