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