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