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