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