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