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