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