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