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