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