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