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