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