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