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