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