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