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