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