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