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