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