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