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