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