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