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