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