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