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