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)(25,26,30,33)(27,28,31,34)(29,32,38,37)(35,36,39,40)(3,7)(6,8)(9,11,15,24)(10,16,19,20)(12,21,22,13)(14,23,17,18)(25,27)(26,28)(29,35)(30,31)(32,36)(33,34)(37,40)(38,39)(1,2)(3,6)(4,5)(7,8)(12,22)(13,21)(14,17)(18,23)(25,26,30,33)(27,34,31,28)(29,37,38,32)(35,36,39,40)(9,12)(10,17)(11,21)(13,24)(14,19)(15,22)(16,18)(20,23)(25,26)(27,28)(29,32)(30,33)(31,34)(35,36)(37,38)(39,40) 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)(25,28)(26,31)(27,33)(29,36)(30,34)(32,39)(35,37)(38,40)(1,2)(3,6)(4,5)(7,8)(9,14,15,17)(10,12,19,22)(11,23,24,18)(13,16,21,20)(25,29,30,38)(26,32,33,37)(27,35,31,39)(28,36,34,40)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.