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