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