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