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