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