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