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