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