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