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