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