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