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