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