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