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