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