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