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