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