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