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