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