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