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