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