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