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