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