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