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