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