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