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