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