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