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