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