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