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