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)(11,12)(13,21)(14,16)(15,19)(17,23)(18,24)(20,22)(25,26,30,32)(27,28,34,36)(29,31,39,38)(33,35,37,40)(1,3,6,4)(2,7,5,8)(9,11,14,19)(10,15,16,12)(13,18,23,22)(17,24,21,20)(25,27)(26,28)(29,37)(30,34)(31,40)(32,36)(33,39)(35,38)(10,16)(12,15)(17,21)(20,24)(25,28,30,36)(26,27,32,34)(29,35,39,40)(31,33,38,37)(9,12)(10,11)(13,20)(14,15)(16,19)(17,18)(21,22)(23,24)(25,28)(26,27)(29,35)(30,36)(31,33)(32,34)(37,38)(39,40) involution — undirected(1,4,6,3)(2,7,5,8)(9,11)(10,12)(13,22)(14,19)(15,16)(17,24)(18,23)(20,21)(25,29)(26,31)(27,33)(28,35)(30,39)(32,38)(34,37)(36,40)(1,5,6,2)(3,8,4,7)(9,13)(10,17)(11,18)(12,20)(14,23)(15,24)(16,21)(19,22)(25,26)(27,28)(29,38)(30,32)(31,39)(33,40)(34,36)(35,37)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.