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