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