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