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