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