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