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