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