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)(11,16)(12,15)(13,17)(14,18)(19,23)(20,22)(21,24)(25,26)(27,36)(28,39)(29,30)(31,35)(32,38)(33,40)(34,37)(1,3,5,8)(2,6,4,7)(9,11,14,12)(10,15,18,16)(13,19,21,20)(17,22,24,23)(25,27,31,38)(26,32,35,36)(28,37,40,29)(30,33,34,39)(9,10,14,18)(11,15,12,16)(13,17,21,24)(19,22,20,23)(25,28,31,40)(26,33,35,39)(27,29,38,37)(30,36,34,32)(1,2,5,4)(3,6,8,7)(9,10)(11,15)(12,16)(13,17)(14,18)(19,22)(20,23)(21,24)(25,28)(26,33)(27,37)(29,38)(30,36)(31,40)(32,34)(35,39)(9,12,14,11)(10,16,18,15)(13,20,21,19)(17,23,24,22)(25,29,31,37)(26,34,35,30)(27,28,38,40)(32,39,36,33)(1,4,5,2)(3,7,8,6)(9,13,14,21)(10,17,18,24)(11,19,12,20)(15,22,16,23)(25,30,31,34)(26,29,35,37)(27,33,38,39)(28,36,40,32)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.