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