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