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