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