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