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