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