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