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