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