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