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