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