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