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