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