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