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