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