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