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