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