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