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