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