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