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