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