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