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