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