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