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