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