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