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