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