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