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