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