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