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