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)(25,26,32,36)(27,37,39,33)(28,31,34,29)(30,35,40,38)(1,2)(3,7)(4,5)(6,8)(9,10)(11,17)(12,20)(13,14)(15,19)(16,21)(18,22)(23,24)(25,27,32,39)(26,33,36,37)(28,30,34,40)(29,35,31,38)(2,5)(6,7)(10,14)(15,17)(16,20)(22,23)(25,28)(26,29)(27,30)(31,36)(32,34)(33,35)(37,38)(39,40) involution — undirected(2,5)(6,7)(9,11)(10,15)(12,18)(13,19)(14,17)(16,22)(20,23)(21,24)(25,29,32,31)(26,34,36,28)(27,38,39,35)(30,37,40,33)(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,14)(17,19)(18,22)(20,21)(23,24)(25,30)(26,35)(27,34)(28,39)(29,37)(31,33)(32,40)(36,38) 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)(25,31,32,29)(26,28,36,34)(27,35,39,38)(30,33,40,37)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.