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