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