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