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