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