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