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