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