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