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