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