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