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