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