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