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)(11,20,23,31)(12,24)(13,18)(14,29)(15,19)(16,22,32,28)(17,26)(21,36,39,30)(25,34)(27,33)(35,38,40,37)(2,6)(3,4)(7,8)(9,11,13,28,15,23,14,22)(10,16,18,31,19,32,29,20)(12,21,26,37,27,39,25,38)(17,30,33,40,34,36,24,35)(2,6)(3,4)(7,8)(9,12)(10,17)(11,21)(13,26)(14,25)(15,27)(16,30)(18,33)(19,34)(20,35)(22,38)(23,39)(24,29)(28,37)(31,40)(32,36) involution — undirected(1,3,5,4)(2,6,8,7)(9,13,15,14)(10,18,19,29)(11,22,23,28)(12,25,27,26)(16,20,32,31)(17,24,34,33)(21,37,39,38)(30,40,36,35)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.