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