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