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