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