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