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