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