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