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