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