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