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