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