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