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