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