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