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