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)(25,26,31,33)(27,34,37,29)(28,38,30,32)(35,39,36,40)(3,7)(6,8)(10,14)(15,22)(16,19)(23,24)(25,27,31,37)(26,29,33,34)(28,35,30,36)(32,39,38,40)(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,14)(17,22)(18,23)(19,21)(20,24)(25,28,31,30)(26,32,33,38)(27,35,37,36)(29,39,34,40)(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)(26,27)(28,39)(30,40)(31,34)(32,35)(33,37)(36,38) 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)(25,26)(27,29)(28,32)(30,38)(31,33)(34,37)(35,39)(36,40) involution — undirected(9,12,13,21)(10,16,14,19)(11,18,17,20)(15,23,22,24)(25,30,31,28)(26,32,33,38)(27,36,37,35)(29,39,34,40)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.