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