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