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