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