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