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