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