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