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