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