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