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