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