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