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