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