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