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