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