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