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