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