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