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