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