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