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)(25,26,31,33)(27,32,36,38)(28,37,35,30)(29,34,39,40)(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)(28,34)(29,30)(31,36)(33,38)(35,40)(37,39)(1,3)(2,4)(5,8)(6,7)(10,14)(15,22)(16,19)(23,24)(26,33)(27,36)(30,37)(34,40) involution — undirected(1,4)(2,3)(5,6)(7,8)(9,11)(10,15)(12,20)(13,17)(14,22)(16,24)(18,21)(19,23)(25,28,31,35)(26,30,33,37)(27,34,36,40)(29,38,39,32)(9,12)(10,16)(11,18)(13,21)(14,19)(15,23)(17,20)(22,24)(25,29)(26,34)(27,30)(28,32)(31,39)(33,40)(35,38)(36,37) involution — undirected(9,10)(11,15)(12,16)(13,14)(17,22)(18,23)(19,21)(20,24)(25,30)(26,35)(27,29)(28,33)(31,37)(32,40)(34,38)(36,39) 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.