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