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