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