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