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