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