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