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