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