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