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