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