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