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