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