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