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