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