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