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