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