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