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