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