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