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