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