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