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