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