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