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