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