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