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