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