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