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