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