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