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