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