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