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