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