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