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