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