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