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