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