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