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