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