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