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