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