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