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