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