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