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