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