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