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