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