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