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