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