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