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