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