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