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