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