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