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