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