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