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