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