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