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