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