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