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