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