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