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