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