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