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