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