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