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