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