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