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