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