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