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