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)(12,20,22,16)(18,24,21,23)(25,26)(27,36)(28,30)(29,38)(31,35)(32,39)(33,40)(34,37)(1,2,4,6)(3,5,7,8)(9,10,14,13)(11,17,19,15)(12,16,22,20)(18,24,21,23)(25,27)(26,32)(28,37)(29,40)(30,38)(31,39)(33,34)(35,36)(1,3)(2,5)(4,7)(6,8)(10,13)(15,17)(16,20)(23,24)(25,28,31,40)(26,33,35,30)(27,37,39,29)(32,34,36,38)(1,2)(3,5)(4,6)(7,8)(9,11)(10,15)(12,21)(13,17)(14,19)(16,24)(18,22)(20,23)(25,29)(26,34)(27,28)(30,32)(31,37)(33,36)(35,38)(39,40) involution — undirected(1,3)(2,5)(4,7)(6,8)(9,12)(10,16)(11,18)(13,20)(14,22)(15,23)(17,24)(19,21)(25,27)(26,32)(28,37)(29,40)(30,38)(31,39)(33,34)(35,36) involution — undirected(9,13,14,10)(11,17,19,15)(12,20,22,16)(18,24,21,23)(25,30,31,33)(26,28,35,40)(27,38,39,34)(29,32,37,36)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.