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