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)(27,33)(28,30)(29,32)(31,35)(34,38)(36,40)(37,39)(3,7)(6,8)(11,13)(15,18)(19,21)(22,23)(25,27,31,29)(26,32,35,33)(28,36,38,39)(30,37,34,40)(1,2)(3,6)(4,5)(7,8)(9,11,14,13)(10,15,17,18)(12,19,20,21)(16,22,24,23)(25,27,31,29)(26,33,35,32)(28,36,38,39)(30,40,34,37)(9,12)(10,16)(11,19)(13,21)(14,20)(15,22)(17,24)(18,23)(25,28)(26,34)(27,36)(29,39)(30,35)(31,38)(32,40)(33,37) 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)(25,29,31,27)(26,32,35,33)(28,36,38,39)(30,40,34,37)(1,2)(3,6)(4,5)(7,8)(9,10)(11,18)(12,16)(13,15)(14,17)(19,23)(20,24)(21,22)(25,30,31,34)(26,28,35,38)(27,37,29,40)(32,36,33,39)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.