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