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