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