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