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