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