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