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