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