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