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