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